CN109992149B

CN109992149B - Touch display device, touch system, touch driving circuit, pen, and pen sensing method

Info

Publication number: CN109992149B
Application number: CN201811573566.8A
Authority: CN
Inventors: 朱秀润; 张亨旭; 裵相赫; 韩圣洙; 丁度荣
Original assignee: LG Display Co Ltd
Current assignee: LG Display Co Ltd
Priority date: 2017-12-29
Filing date: 2018-12-21
Publication date: 2022-06-28
Anticipated expiration: 2038-12-21
Also published as: JP6768053B2; TW201931092A; KR20190081539A; JP2019121389A; TWI697819B; CN109992149A; DE102018130222A1; US10768719B2; US20190204939A1; KR102468750B1

Abstract

A touch display device, a touch system, a touch driving circuit, a pen, and a pen sensing method. Embodiments of the present disclosure relate to a touch display device, a touch system, a touch driving circuit, a pen, and a pen sensing method, and more particularly, to a touch display device, a touch system, a touch driving circuit, a pen, and a pen sensing method, which may receive a first downlink signal and a second downlink signal output from a pen through all or some of a plurality of touch electrodes and may sense a pen based on a received signal strength of each touch electrode for the first downlink signal and a received signal strength of each touch electrode for the second downlink signal. According to the embodiments of the present disclosure, a pen can be accurately sensed even when a user uses the pen in a tilted manner.

Description

Touch display device, touch system, touch driving circuit, pen, and pen sensing method

Technical Field

The present disclosure relates to a touch display device, a touch system, a touch driving circuit, a pen, and a pen sensing method.

Background

According to the development of the information society, demands for various forms of touch display devices for displaying images have increased. Recently, various display devices, such as a liquid crystal display device, a plasma display device, and an organic light emitting display device, have come to be used.

Such display devices provide a touch-based input method, which allows a user to easily input information or commands in an intuitive and convenient manner without using conventional input methods such as buttons, a keyboard, a mouse, and the like.

In order to provide such a touch-based input method, it is necessary to determine the presence or absence of a user touch and accurately detect touch coordinates thereof.

In addition to fingers and the like, pen touch technologies have also been developed to respond to the increasing demand for complex pen touch inputs.

In such a conventional pen touch technique, there is no big problem when a user vertically uses a pen. However, when the user uses the pen in a tilted manner, the position of the pen may be sensed at a position different from the actual position of the pen.

In this case, an erroneous operation may be performed such that an operation related to the corresponding pen touch input cannot be performed or an operation unrelated thereto is performed, or a touch-related indication may be made at a point different from a point touched (written) by the user using the pen. This phenomenon may become worse depending on whether the user is right-handed or left-handed.

Disclosure of Invention

In this context, one aspect of the present disclosure is to accurately sense a pen even when the user uses the pen in a tilted manner.

Another aspect of the present disclosure is to provide a pen having two signal transmission media (e.g., a tip and a ring), and by which the tilt of the pen is more accurately sensed.

It is yet another aspect of the present disclosure to sense accurate pen coordinates by correcting coordinate errors due to pen tilt.

Yet another aspect of the present disclosure is to effectively sense the pen by driving two signal transmission media (e.g., tip and ring) of the pen in a time division manner.

Another aspect of the present disclosure is to quickly sense the pen by driving two signal transmission media (e.g., tip and ring) of the pen simultaneously.

According to an aspect of the present disclosure, there is provided a touch display device including: a touch panel configured to include a plurality of touch electrodes; and a touch circuit configured to receive the first and second downlink signals output from the pen through all or some of the plurality of touch electrodes, and detect pen coordinates or pen tilt of the pen based on a received signal strength of each touch electrode for the first downlink signal and a received signal strength of each touch electrode for the second downlink signal.

In such a touch display device, when the pen is inclined at a predetermined angle or more with respect to the surface of the touch panel, the touch electrode receiving the maximum value among the received signal strengths of the respective touch electrodes for the first downlink signal and the touch electrode receiving the maximum value among the received signal strengths of the respective touch electrodes for the second downlink signal are different from each other.

The first downstream signal and the second downstream signal may each be a voltage level variable modulated signal.

The first downlink signal and the second downlink signal may have different amplitudes.

The first downlink signal and the second downlink signal may have a phase difference therebetween.

The first and second downlink signals may be output from the pen during different periods.

The first and second downlink signals may be output from the pen during the same period.

The touch circuit may sense pen coordinates and pen tilt based on the received signal strength of each touch electrode for the first downlink signal and the received signal strength of each touch electrode for the second downlink signal.

According to another aspect of the present disclosure, there is provided a pen including: a housing; a tip configured to protrude to an outside of the housing; a ring configured to be disposed inside the housing and having a shape surrounding an inner side surface of the housing; and a pen driving circuit configured to be disposed inside the housing, electrically connected to one or more of the tip and the ring, and output a downstream signal through one or more of the tip and the ring.

In such a pen, the down signal output from the tip and the down signal output from the ring may have different signal strengths at the position of the tip or may both have a phase difference.

In addition, the pen driver circuit may drive the tip and ring in a time division manner or simultaneously.

The pen may further comprise: a first switch circuit configured to electrically connect the tip to the pen driving circuit at a first timing when the tip and the ring are driven in a time-division manner, and to electrically connect the ring to the pen driving circuit at a second timing different from the first timing.

The pen may further include: a second switching circuit configured to electrically connect the tip and the ring to the pen driving circuit simultaneously when the tip and the ring are driven simultaneously.

According to still another aspect of the present disclosure, there is provided a touch driving circuit including: a driving unit configured to provide an up signal to all or some of a plurality of touch electrodes included in the touch panel; and a sensing unit configured to generate and output sensing data when the first and second downlink signals output from the pen are received through all or some of the plurality of touch electrodes.

When the pen is inclined at a predetermined angle or more with respect to the surface of the touch panel, the touch electrode receiving the maximum value of the received signal strengths of the touch electrodes for the first downlink signal and the touch electrode receiving the maximum value of the received signal strengths of the touch electrodes for the second downlink signal may be different from each other.

The first and second downlink signals may be output from the pen during different time periods.

According to another aspect of the present disclosure, there is provided a pen sensing method including: providing an up signal to all or some of a plurality of touch electrodes included in a touch panel; receiving a first downlink signal and a second downlink signal output from the pen through all or some of the plurality of touch electrodes; and sensing the pen based on the received signal strength of each touch electrode for the first downlink signal and the received signal strength of each touch electrode for the second downlink signal.

The first downlink signal and the second downlink signal may be received during different periods or during the same period.

Sensing pen coordinates and/or pen tilt of the pen may comprise: determining tip coordinates of a tip included in the pen according to the received signal strength of each touch electrode for the first downlink signal, and determining ring coordinates of a ring included in the pen according to the received signal strength of each touch electrode for the second downlink signal, calculating a distance between the tip coordinates and the ring coordinates, and determining pen coordinates by correcting the tip coordinates or the ring coordinates based on the distance between the tip coordinates and the ring coordinates.

Sensing pen coordinates and/or pen tilt of the pen may comprise: determining tip coordinates of a tip included in the pen according to the received signal strength of each touch electrode for the first downlink signal, and determining ring coordinates of a ring included in the pen according to the received signal strength of each touch electrode for the second downlink signal, calculating a distance between the tip coordinates and the ring coordinates, calculating a pen tilt of the pen based on the distance between the tip coordinates and the ring coordinates and the distance between the tip and the ring, and determining pen coordinates based on the pen tilt, the pen coordinates, and the ring coordinates.

Sensing pen coordinates and/or pen tilt of the pen may comprise: determining tip coordinates of a tip included in the pen according to the received signal strength of each touch electrode for the first downlink signal, and determining ring coordinates of a ring included in the pen according to the received signal strength of each touch electrode for the second downlink signal, calculating a distance between the tip coordinates and the ring coordinates, calculating a pen tilt of the pen based on the distance based on the tip coordinates and the ring coordinates, calculating a constant correction value of a pen coordinate offset based on the distance, and calculating a direction correction value of the pen coordinate offset based on the pen tilt, and determining pen coordinates based on the tip coordinates or the ring coordinates, the constant correction value of the pen coordinate offset, and the direction correction value.

According to still another aspect of the present disclosure, there is provided a touch system including: a touch display device configured to include: a touch panel including a plurality of touch electrodes and a touch circuit for providing an up signal to all or some of the plurality of touch electrodes and receiving a down signal through all or some of the plurality of touch electrodes; and a stylus configured to receive the upstream signal and output the downstream signal.

The touch circuit may receive the first and second downlink signals output from the pen through all or some of the plurality of touch electrodes, and may sense the pen based on a received signal strength of each touch electrode for the first downlink signal and a received signal strength of each touch electrode for the second downlink signal.

When the pen is inclined at a predetermined angle or more with respect to the surface of the touch panel, the touch electrode receiving the maximum value among the received signal strengths of the touch electrodes for the first downlink signal and the touch electrode receiving the maximum value among the received signal strengths of the touch electrodes for the second downlink signal may be different from each other.

As described above, according to the embodiments of the present disclosure, even if a user uses a pen in a tilted manner, the pen can be accurately sensed.

In addition, according to an embodiment of the present disclosure, a pen having two signal transmission media (e.g., a tip and a ring) may be provided, and a pen tilt may be more accurately sensed by the pen.

In addition, according to the embodiments of the present disclosure, accurate pen coordinates may be sensed by correcting a coordinate error due to pen tilting.

In addition, according to the embodiments of the present disclosure, the pen can be effectively sensed by driving two signal transmission media (tip and ring) of the pen in a time division manner.

In addition, according to the embodiment of the present disclosure, the pen can be sensed rapidly by driving two signal transmission media (tip and ring) of the pen at the same time.

Drawings

The above and other aspects, features and advantages of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic diagram of a touch system according to an embodiment of the present invention;

fig. 2 is a diagram illustrating a display portion in a touch display device according to an embodiment of the present disclosure;

fig. 3 and 4 are diagrams illustrating two types of touch sensing parts in a touch display device according to an embodiment of the present disclosure;

fig. 5 is a diagram showing an implementation example of a touch display device according to an embodiment of the present disclosure;

fig. 6 is a diagram illustrating driving timings representing a time-division driving method of touch driving and display driving of the touch display device according to an embodiment of the present invention.

Fig. 7 is a diagram illustrating driving timings representing independent driving methods of display driving and touch driving of the touch display device according to an embodiment of the present disclosure;

fig. 8 is a diagram illustrating a touch driving operation between a touch display device and a pen according to an embodiment of the present disclosure;

fig. 9 is a diagram illustrating an example of driving timings for a touch driving operation between a touch display device and a pen according to an embodiment of the present disclosure;

FIG. 10 is a diagram illustrating a pen according to an embodiment of the present disclosure;

fig. 11 is a diagram illustrating a distribution of received signal strengths of respective touch electrodes with respect to a down signal output from a pen when the pen is vertically used according to an embodiment of the present disclosure;

fig. 12 is a graph illustrating a distribution of received signal strengths of respective touch electrodes with respect to a down signal output from a pen when the pen is used in a tilted manner according to an embodiment of the present disclosure;

FIG. 13 is a diagram illustrating a pen according to an embodiment of the present disclosure;

FIG. 14 is a diagram illustrating a ring structure in a pen according to an embodiment of the present disclosure;

FIGS. 15 and 16 are diagrams illustrating a distance between a tip and a ring in a pen according to an embodiment of the present disclosure;

FIGS. 17 and 18 are diagrams illustrating first and second down signals output from a tip and a ring of a pen and received by a touch driving circuit, respectively, according to an embodiment of the present disclosure;

fig. 19 is a graph showing a received signal strength of each touch electrode with respect to a distribution of first and second downlink signals output from a pen according to an embodiment of the present disclosure when the pen is used vertically;

fig. 20 is a graph showing a received signal strength of each touch electrode with respect to a distribution of first and second downlink signals output from a pen according to an embodiment of the present disclosure when the pen is used in a tilted manner;

Fig. 21 and 22 are diagrams illustrating tip coordinates and ring coordinates according to a change in pen tilt, and an environment for measuring a distance between the tip coordinates and the ring coordinates and a measurement result according to an embodiment of the present disclosure;

FIG. 23 is a flow chart illustrating a pen sensing method according to an embodiment of the present disclosure;

FIG. 24 is a flow chart illustrating pen sensing operations in a pen sensing method according to an embodiment of the present disclosure;

FIG. 25 is a diagram illustrating an example of a method of calculating pen tilt and pen coordinates according to a pen sensing method according to an embodiment of the present disclosure;

FIG. 26 is another flow chart illustrating a pen sensing method according to an embodiment of the present disclosure;

fig. 27 is a diagram illustrating driving timings of touch driving operations between the touch display device and the pen according to the embodiment of the present disclosure when the tip and the ring of the pen are driven in a time-division manner;

fig. 28 is a diagram showing an example of a switching structure of the tip and the ring of each pen according to the embodiment of the present disclosure when the tip and the ring are driven in a time-division manner;

fig. 29 is a diagram illustrating driving timings of touch driving operations between the touch display device and the pen according to the embodiment of the present disclosure when the tip and the ring of the pen are simultaneously driven;

Fig. 30 is a diagram illustrating an example of a switching structure of the tip and the ring of each pen according to an embodiment of the present disclosure when the tip and the ring of the pen are simultaneously driven;

fig. 31 is a diagram illustrating an example of a touch driving circuit according to an embodiment of the present disclosure; and

fig. 32 is a block diagram illustrating a touch driving circuit according to an embodiment of the present disclosure.

Detailed Description

Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Where reference numerals are used to refer to elements in the drawings, the same reference numerals will be used to refer to the same elements as much as possible, although they may be shown in different drawings. Further, in the following description of the present disclosure, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present disclosure rather unclear.

Additionally, when describing elements of the present disclosure, terms such as first, second, A, B, (a), (b), etc. may be used herein. These terms are only used to distinguish the corresponding elements from other elements, and the nature, order, sequence or number of the corresponding elements are not limited by these terms. When an element is described as being "connected to," "coupled to," or "linked to" another element, it is to be understood that the element may be not only directly "connected to," "coupled to," or "linked to" another element, but also "connected to," "coupled to," or "linked to" another element through a third element, or the third element may be interposed between the element and the other element.

Fig. 1 is a schematic diagram illustrating a touch system according to an embodiment of the present disclosure.

The touch system according to the embodiment of the present disclosure may include the touch display device 10, the pen 20 cooperating with the touch display device 10, and the like.

The touch display device 10 according to the embodiment of the present disclosure may provide not only an image display function of displaying an image but also a touch sensing function of a finger, a pen 20, or the like.

Here, the "pen 20" may include an active pen (active pen) having a signal transmission/reception function, operating in cooperation with the touch display device 10, or having its own power supply, and a passive pen (passive pen); the passive pen is a touch tool without a signal transmission/reception function and its own power supply.

Here, the touch tool refers not only to a finger but also to any object that can touch the screen instead of the finger, and may be referred to as a touch object or a touch pointer.

In the following description, a finger can be considered to represent a passive touching implement such as a passive pen, while the pen 20 can be considered to represent an active touching implement such as an active pen. Pen 20 may be referred to herein as a stylus, stylus pen, or active stylus pen.

The touch display device 10 according to the embodiment of the present disclosure may be, for example, a Television (TV), a monitor, or a mobile device such as a tablet computer or a smart phone.

The touch display device 10 according to the embodiment of the present disclosure may include a display section for providing an image display function and a touch sensing section for touch sensing.

Hereinafter, the structures of the display portion and the touch sensing portion of the touch display device 10 will be briefly described with reference to fig. 2 to 4.

Fig. 2 is a diagram illustrating a display portion in the touch display device 10 according to the embodiment of the present disclosure.

Referring to fig. 2, the display portion of the touch display device 10 according to the embodiment of the present disclosure may include a display panel 110, a data driving circuit 120, a gate driving circuit 130, a display controller 140, and the like.

On the display panel 110, a plurality of data lines DL and a plurality of gate lines GL are arranged, and a plurality of sub-pixels SP defined (spaced) by the plurality of data lines DL and the plurality of gate lines GL are arranged.

The data driving circuit 120 may supply a data voltage to the plurality of data lines DL to drive the plurality of data lines DL.

The gate driving circuit 130 may sequentially supply scan signals to the plurality of gate lines GL to drive the plurality of gate lines GL.

The display controller 140 may provide various control signals DCS and GCS to the data driving circuit 120 and the gate driving circuit 130 to control the operations of the data driving circuit 120 and the gate driving circuit 130.

The display controller 140 may start to perform scanning according to the timing implemented in each display frame, may switch input image DATA input from the outside according to a DATA signal format used by the DATA driving circuit 120 to output the image DATA, and may control DATA driving at an appropriate time according to the scanning.

The display controller 140 may be a timing controller used in conventional display technologies or a control device including a timing controller to further perform other control functions.

The display controller 140 may be implemented as a separate component from the data driving circuit 120 or may be implemented as an integrated circuit together with the data driving circuit 120.

Meanwhile, the data driving circuit 120 may be implemented by including at least one source driver integrated circuit.

Each source driver integrated circuit may include a shift register, a latch circuit, a digital-to-analog converter (DAC), an output buffer, and the like. In some cases, each source driver integrated circuit may also include an analog-to-digital converter (ADC).

The gate driving circuit 130 may be implemented by including at least one gate driver integrated circuit.

Each gate driver integrated circuit may include a shift register, a level shifter, and the like.

The data driving circuit 120 may be located only at one side (e.g., an upper side or a lower side) of the display panel 110. In some cases, the data driving circuit 120 may be located at both sides (e.g., both upper and lower sides) of the display panel 110 according to a driving method, a panel design method, and the like.

The gate driving circuit 130 may be located at only one side (e.g., left or right) of the display panel 110. In some cases, the gate driving circuit 130 may be located at both sides (e.g., both left and right sides) of the display panel 110 according to a driving method, a panel design method, and the like.

Meanwhile, the display panel 110 may be various types of display panels, such as a liquid crystal display panel, an organic light emitting display panel, a plasma display panel, and the like.

Fig. 3 and 4 are diagrams illustrating two types of touch sensing parts in the touch display device 10 according to the embodiment of the present disclosure.

Fig. 3 is a diagram illustrating a touch sensing part for mutual capacitance-based touch sensing in the touch display device 10 according to an embodiment of the present disclosure, and fig. 4 is a diagram illustrating a touch sensing part for self capacitance-based touch sensing in the touch display device 10 according to an embodiment of the present disclosure.

Referring to fig. 3 and 4, the touch display device 10 may sense the presence or absence of a touch or a touch position through a finger and/or a pen 20 by a capacitance-based touch sensing technology.

For this, as shown in fig. 3 and 4, the touch display device 10 may include a touch panel TSP on which a plurality of touch electrodes TE are disposed and a touch circuit 300 for driving the touch panel TSP.

The touch display device 10 may provide a mutual capacitance-based touch sensing function for sensing a touch input by measuring a capacitance formed between two touch electrodes Tx _ TE and Rx _ TE or a change in the capacitance.

Unlike this, the touch display device 10 may provide a self-capacitance-based touch sensing function for sensing a touch input by measuring a capacitance or a change in capacitance formed by each touch electrode TE.

Referring to fig. 3, for the mutual capacitance-based touch sensing, first touch electrode lines T1 through T5 (also referred to as touch driving lines) applying a touch driving signal and second touch electrode lines R1 through R6 (also referred to as touch sensing lines) sensing a touch signal may be arranged in a crossing manner on the touch panel TSP.

The first touch electrode lines T1 to T5 may each be a bar-type electrode extending in a horizontal direction, and the second touch electrode lines R1 to R6 may each be a bar-type electrode extending in a vertical direction.

Unlike this, as shown in fig. 3, the first touch electrode lines T1 to T5 may each be formed by electrically connecting first touch electrodes Tx _ TE (also referred to as touch driving electrodes) arranged in the same row, and the second touch electrode lines R1 to R6 may each be formed by electrically connecting second touch electrodes Rx _ TE (also referred to as touch sensing electrodes) arranged in the same column.

The first touch electrode lines T1 to T5 may each be electrically connected to the touch circuit 300 through one or more signal lines SL. The second touch electrode lines R1 to R6 may each be electrically connected to the touch circuit 300 through one or more signal lines SL.

Referring to fig. 4, for self-capacitance based touch sensing, a plurality of touch electrodes TE may be disposed on the touch panel TSP.

The touch driving signal may be applied to each of the plurality of touch electrodes TE, and a touch sensing signal may be sensed from the touch electrode.

Each of the plurality of touch electrodes TE may be electrically connected to the touch circuit 300 through one or more signal lines SL.

Hereinafter, for convenience of description, it is assumed that the touch display device 10 provides a self capacitance-based touch sensing method, and the touch panel TSP is designed, as shown in fig. 4, for self capacitance-based touch sensing.

The shape of one touch electrode TE shown in fig. 3 and 4 is merely exemplary and may be designed in various ways.

In addition, the size of the area where one touch electrode TE is formed may correspond to the size of the area where one sub-pixel SP is formed.

Alternatively, the size of the area where one touch electrode TE is formed may be larger than the size of the area where one sub-pixel SP is formed. In this case, one touch electrode TE may overlap two or more data lines DL and two or more gate lines GL.

For example, the size of the area where one touch electrode TE is formed may correspond to the size of several to several tens of sub-pixel areas.

Meanwhile, the touch panel TSP may be an external type (also referred to as an add-on type) touch panel that is manufactured separately from the display panel 110 and is coupled to the display panel 110, or may be an embedded type (e.g., an in-box type, an on-box type, etc.) touch panel that is embedded in the display panel 110.

When the touch panel TSP is embedded in the display panel 110, the touch electrodes TE may be formed together with other electrodes or signal lines related to display driving when the display panel 110 is manufactured.

Fig. 5 is a diagram illustrating an implementation example of the touch display device 10 according to the embodiment of the present disclosure. However, fig. 5 is an implementation example in which the touch panel TSP is embedded in the display panel 110.

Referring to fig. 5, the touch circuit 300 may include one or more touch driving circuits TIC for providing touch driving signals to the touch panel TSP and detecting (receiving) touch sensing signals from the touch panel TSP, a touch controller TCR for detecting the presence or absence of a touch input and/or a touch position using the touch sensing signal detection result of the touch driving circuits TIC, and the like.

The one or more touch driving circuits TIC included in the touch circuit 300 may each be implemented as one Integrated Circuit (IC).

Meanwhile, one or more touch driving circuits TIC included in the touch circuit 300 may be integrally implemented with one or more source/readout integrated circuits (SRICs) together with one or more Source Driver Integrated Circuits (SDICs) implementing the data driving circuit 120.

That is, the touch display device 10 may include one or more SRICs, and each SRIC may include touch driving circuits TIC and SDIC.

In this way, with respect to the integrated implementation of the touch driving circuit TIC for touch driving and the SDIC for data driving, when the touch panel TSP is an internal type touch panel embedded in the display panel 110 and the signal lines SL connected to the touch electrodes TE are arranged in parallel with the data lines DL, the touch driving and the data driving may be effectively performed.

Meanwhile, when the touch panel TSP is an internal type touch panel embedded in the display panel 110, each touch electrode TE can be formed in various ways.

When the touch display device 10 is implemented as a liquid crystal display device or the like, the common electrode to which the common voltage is applied during the display driving period for displaying an image may be divided into several blocks and used as the touch electrode TE. For example, a touch driving signal may be applied to the touch electrode TE during a touch driving period for touch sensing, or a touch sensing signal may be detected from the touch electrode TE, and a common voltage may be applied to the touch electrode TE during a display driving period for displaying an image.

In this case, during the display driving period, the touch electrodes TE may be electrically connected to each other within the touch circuit 300, and the common voltage may be commonly applied to the touch electrodes TE.

During the touch driving period, some or all of the touch electrodes TE may be selected within the touch circuit 300. Here, the touch driving signal may be applied to the selected one or more touch electrodes TE from the touch driving circuit TIC of the touch circuit 300, or the touch sensing signal may be detected from the selected one or more touch electrodes TE by the touch driving circuit TIC of the touch circuit 300.

In addition, each touch electrode TE may have a plurality of slits (also referred to as holes) to form an electric field with the pixel electrode within the plurality of overlapping sub-pixels.

Meanwhile, when the touch display device 10 is implemented as an organic light emitting display device, a plurality of touch electrodes TE and a plurality of signal lines SL may be disposed on the entire surface of the display panel 110 and may be on an encapsulation layer disposed on a common electrode (e.g., a cathode electrode, etc.) to which a common voltage is applied.

Here, the common electrode disposed on the entire surface of the display panel 110 may be a cathode electrode of an Organic Light Emitting Diode (OLED) within each sub-pixel SP instead of an anode electrode thereof (corresponding to a pixel electrode), and the common voltage may be a cathode voltage.

In this case, each of the plurality of touch electrodes TE may be provided in the form of an electrode having no opening area (opening). At this time, each of the plurality of touch electrodes TE may be a transparent electrode for emitting light in the sub-pixel SP.

Alternatively, each of the plurality of touch electrodes TE may be a mesh-type electrode having a plurality of opening areas (openings). At this time, in each of the plurality of touch electrodes TE, each opening region may correspond to a light emitting region of the subpixel SP (e.g., a region where a portion of the anode electrode is located).

Meanwhile, when a panel driving signal is supplied to the touch electrode TE and the signal line SL during a touch driving period (touch sensing period), the same signal as the panel driving signal or a signal corresponding thereto may be even applied to other electrodes and signal lines that may not be related to touch sensing. Here, the panel driving signal may be a touch driving signal output from the touch circuit 300 to sense a touch input of a finger and/or the pen 20 or recognize pen information of the pen 20.

For example, during the touch driving period, a panel driving signal or a signal corresponding thereto may be applied to all or some of the data lines DL.

As another example, during the touch driving period, a panel driving signal or a signal corresponding thereto may be applied to all or some of the gate lines GL.

As still another example, during the touch driving period, the panel driving signal or a signal corresponding thereto may be applied to all or some of the touch electrodes TE.

Meanwhile, in the embodiment of the present disclosure, the panel driving signal may refer to all signals applied to the touch panel TSP, the display panel 110, or the display panel 110 including the touch panel TSP embedded therein.

Meanwhile, regarding implementation and arrangement of the integrated circuit, for example, in the touch display device 10, the SRIC may be mounted on a film, one end of the film may be connected to the touch panel TSP, and the other end of the film may be connected to a Printed Circuit Board (PCB) to electrically connect the touch driving circuits TIC and SDIC to the display panel 110. In this case, the SRIC may be referred to as a Chip On Film (COF) type SRIC.

The mounted touch controller TCR may be mounted on a PCB, the PCT being connected to a membrane on which the SRIC is mounted.

Meanwhile, the SRIC may also be implemented as a Chip On Glass (COG) type SRIC attached to the touch panel TSP.

Meanwhile, one or more touch driving circuits TIC and touch controller TCR of the touch circuit 300 may be integrated into one component and implemented.

Fig. 6 is a diagram illustrating driving timings representing a time-division driving method of touch driving and display driving of the touch display device 10 according to the embodiment of the present disclosure.

Referring to fig. 6, the touch display device 10 according to the embodiment of the present disclosure may perform "display driving" for displaying an image and "touch driving" (finger touch driving and/or pen touch driving) for sensing a touch (finger touch and/or pen touch) of a finger and/or a pen 20 in a time division manner.

In the touch display device 10, the display drive periods D1, D2, … … and the touch drive periods T1, T2, … … are alternately allocated.

The display driving may be performed to display an image during the display driving periods D1, D2, …, and the touch driving (finger touch driving and/or pen touch driving) may be performed to sense a finger touch or a pen touch during the touch driving periods T1, T2, ….

In the case of the time-division driving method, the touch driving periods T1, T2, … may be blank periods in which display driving is not performed.

Meanwhile, the touch display device 10 may generate the synchronization signal TSYNC swung to a high level and a low level, and may recognize or control the display driving periods D1, D2 … and the touch driving periods T1, T2, … using the synchronization signal TSYNC. That is, the synchronization signal TSYNC may be a driving timing control signal defining the touch driving periods T1, T2, ….

For example, a high level interval (or a low level interval) of the synchronization signal TSYNC may represent the touch driving periods T1, T2, …, and a low level interval (or a high level interval) of the synchronization signal TSYNC may represent the display driving periods D1, D2, ….

Meanwhile, the single display frame period may include one display driving period and one touch driving period. In this case, after one display frame screen is displayed, touch driving may be performed.

Unlike this, the single display frame period may include two or more display driving periods and two or more touch driving periods.

For example, referring to fig. 6, a single display frame period may include 16 display driving periods D1 through D16 and 16 touch driving periods T1 through T16. In this case, a single display frame screen may be divided by 1/16 to be displayed, and touch driving may be performed between the divided display frame screens.

Fig. 7 is a diagram illustrating driving timings representing independent driving methods of display driving and touch driving of the touch display device 10 according to the embodiment of the present disclosure.

Referring to fig. 7, the touch display device 10 according to the embodiment of the present disclosure may independently perform a "display drive" for displaying an image and a "touch drive" (finger touch drive and/or pen touch drive) for sensing a touch (finger touch and/or pen touch) of a finger and/or a pen 20.

In this case, as shown in fig. 6, the display driving and the touch driving may be performed in different time zones (time zones) in which time division has been performed, or may be simultaneously performed in the same time zone. Alternatively, the display driving and the touch driving may be performed in a time-division manner, and then the display driving and the touch driving may be simultaneously performed at an arbitrary timing.

When the display driving and the touch driving are independently performed, the touch driving may be performed independently of the display driving, and conversely, the display driving may be performed independently of the touch driving.

In the touch display device 10, the display driving periods D1, D2, … and the touch driving periods T1, T2 … are alternately allocated.

For example, when the display driving and the touch driving are simultaneously performed, the touch driving may be performed so that a finger touch or a pen touch may be sensed while displaying an image according to the display driving.

When the display driving and the touch driving are independently performed, the display driving period may be controlled by a normal display driving control signal (e.g., a vertical synchronization signal (Vsync), etc.). The touch driving period may be controlled by a synchronization signal TSYNC.

In this case, unlike the synchronization signal TSYNC of fig. 6, which defines the display driving periods D1, D2, … and the touch driving periods T1, T2 …, respectively, the synchronization signal TSYNC may define only the touch driving periods T1, T2, ….

For example, a period in which the synchronization signal TSYNC is at a high level (or a low level) may represent a touch driving period T1, T2, … in which the touch driving is performed, and a period in which the synchronization signal TSYNC is at a low level (or a high level) may represent a period in which the touch driving is not performed.

Meanwhile, during one high level period (or low level period) in the synchronization signal TSYNC (i.e., during one touch driving period), a finger touch and/or a pen touch may be sensed once in the entire screen area. In this case, one touch driving period may correspond to one touch frame period.

Unlike this, a finger touch and/or a pen touch may be sensed once in the entire screen area during two or more high level periods (or low level periods) in the synchronization signal TSYNC (i.e., during two or more touch driving periods). In this case, two or more touch driving periods may correspond to one touch frame period.

For example, during 16 high level periods (or low level periods) in the synchronization signal TSYNC (i.e., during 16 touch driving periods), a finger touch and/or a pen touch may be sensed once in the entire screen area. In this case, 16 touch driving periods may correspond to one touch frame period.

Meanwhile, in each touch driving period T1, T2, …, finger touch driving for sensing a finger touch or pen touch driving for sensing a pen touch may be performed.

In addition, the touch panel TSP may be embedded in the display panel 110 or may exist outside the display panel 110. Hereinafter, for convenience of description, a case where the touch panel TSP is embedded in the display panel 110 will be described, and the touch panel TSP is also simply referred to as the panel TSP as an example.

Fig. 8 is a diagram illustrating a touch driving operation between the touch display device 10 and the pen 20 according to an embodiment of the present disclosure.

At the time of pen touch driving for sensing a pen touch, the touch circuit 300 of the touch display device 10 may transmit and receive a signal to and from the pen 20 via the touch panel TSP.

A signal supplied from the touch circuit 300 to the touch panel TSP and transmitted to the pen 20 through the touch panel TSP is referred to as an up signal, and a signal output from the pen 20 to the touch panel TSP and transmitted to the touch circuit 300 through the touch panel TSP is referred to as a down signal.

The method and timing for signal transmission and reception between the touch display device 10 and the pen 20 for pen touch driving and pen touch sensing, the format of signals to be transmitted and received, and the like may be predefined by a protocol. Such protocols may be implemented by programs or code or data related to program execution and stored in touch circuit 300 and pen 20, or may be executed by touch circuit 300 and pen 20.

For the pen touch driving for sensing a pen touch, the touch display device 10 may define a cooperative operation between the touch display device 10 and the pen 20, may control a driving operation of the pen 20, or may provide an up signal including various information required for the driving operation of the pen 20.

More specifically, the touch circuit 300 of the touch display device 10 supplies the up signal to one or more touch electrodes TE among the plurality of touch electrodes TE included in the touch panel TSP. Accordingly, the pen 20 adjacent to the touch panel TSP may receive an up signal through one or more of the plurality of touch electrodes TE included in the touch panel TSP.

In response to an up signal transmitted from the touch display device 10, the pen 20 may output a down signal that causes the touch circuit 300 to sense pen coordinates (referred to as a position) and/or pen tilt (simply referred to as a tilt) of the pen 20.

Alternatively, pen 20 may output a downstream signal indicating various additional information and the like in response to an upstream signal transmitted from touch display device 10.

In this manner, the down signal output from the pen 20 may be applied to one or more touch electrodes TE among the plurality of touch electrodes TE included in the touch panel TSP.

The touch circuit 300 of the touch display device 10 may receive the downlink signal output from the pen 20 via one or more touch electrodes TE, and may sense pen coordinates and/or pen tilt of the pen 20 or recognize various types of additional information about the pen 20 based on the received downlink signal.

The uplink signal may include, for example, a beacon or ping (ping) signal.

The beacon is a control signal that defines a cooperative operation between the touch display device 10 and the pen 20, controls a driving operation of the pen 20, or includes various information required for the driving operation of the pen 20.

For example, the beacon may include panel information (e.g., panel state information, panel identification information, panel type information such as an in-box type, etc.), panel driving mode information (e.g., pattern recognition information such as a pen search pattern or a pen pattern), characteristic information of a downstream signal (e.g., frequency, number of pulses, etc.), driving timing related information, multiplexer driving information, power mode information (e.g., LHB information regarding the panel and pen not being performed to reduce power consumption, etc.), and may further include information for driving synchronization between the touch panel TSP and the pen 20.

The ping signal may be a synchronization control signal for synchronizing the downlink signal.

Additional information that may be included in the downstream signal may include, for example, one or more of the following: pen pressure, pen ID, button information, battery information, information for information error checking and correction, and the like.

Fig. 9 is a diagram illustrating an example of driving timings of touch driving operations between the touch display device 10 and the pen 20 according to an embodiment of the present disclosure. However, it is assumed that 16 touch driving periods T1 to T16 are regularly repeated. In this case, the 16 touch driving periods T1 to T16 may be referred to as one touch frame period, and both a finger touch and a pen touch may be sensed during the one touch frame period.

Fig. 9 illustrates a down signal output from the pen 20 and various signals (including an up signal) supplied to the touch panel TSP by the touch circuit 300 according to predetermined timing of a protocol.

Referring to fig. 9, a beacon, which is one of the up signals, may be transmitted from the touch panel TSP to the pen 20 one or more times during one touch frame period corresponding to 16 touch driving periods T1 to T16, and the beacon transmission period may be one or two or more touch driving periods (T1 in the example of fig. 9) predetermined according to a protocol among the 16 touch driving periods T1 to T16.

Meanwhile, the beacon may be periodically transmitted every touch frame period, may be periodically transmitted every two or more touch frame periods, or may be transmitted in any touch frame period according to a predetermined event or the like.

When a beacon is transmitted from the touch panel TSP to the pen 20, the pen 20 may output a downlink signal in a touch driving period (T2, T3, T5, T6, T7, T9, T13, T14, and T15 in the example of fig. 9) determined according to a predetermined protocol in response to the beacon.

The downlink signal output from the pen 20 may be a downlink signal that allows the touch display device 10 to sense pen coordinates (position) and pen tilt of the pen 20.

For example, one downlink signal output from the pen 20 may be a downlink signal allowing the touch display device 10 to sense one of pen coordinates and pen tilt of the pen 20, or may be a downlink signal allowing the touch display device 10 to sense both of pen coordinates and pen tilt of the pen 20.

In addition, the downlink signal output from the pen 20 may be a downlink signal representing data including various additional information of the pen 20. Here, the data includes various additional information of the pen 20, and the various types of additional information may include, for example, pen pressure, pen ID, button information, battery information, information for information error check and correction, and the like.

The down signal output from the pen 20 may be applied to one or more of the plurality of touch electrodes TE included in the touch panel TSP.

Meanwhile, referring to fig. 9, the 16 touch driving periods T1 to T16 included in one touch frame period may include one or more touch driving periods (e.g., T2, T5, T9, and T13) for sensing one or more of pen coordinates and pen tilt.

According to such touch driving periods (e.g., T2, T5, T9, and T13), the pen 20 may output a down signal related to one or more of sensing pen coordinates and pen tilt.

In this case, the downstream signal may be a signal composed of pulses periodically oscillating between a high level and a low level.

In addition, referring to fig. 9, the 16 touch driving periods T1 to T16 included in one touch frame period may include one or more touch driving periods (e.g., T3, T6, T7, T14, and T15) capable of sensing data.

The pen 20 may output a down signal related to data sensing according to a touch driving period (e.g., T3, T6, T7, T14, and T15).

In this case, the downstream signal may be a signal composed of non-periodic pulses representing additional information included in the corresponding data.

As described above, when the downlink signal is output from the pen 20 according to the touch driving period defined in the protocol, the touch circuit 300 may receive the downlink signal through the touch panel TSP and may perform the pen sensing process based on the received downlink signal.

Here, the pen sensing process may include one or more of the following processes: a process of sensing pen coordinates, a process of sensing pen tilt, and a process of recognizing pen additional information included in the data.

Meanwhile, the 16 touch driving periods T1 to T16 included in one touch frame period may include one or more touch driving periods (e.g., T4, T6, T10, T11, T12, and T16) for sensing a finger touch.

During one or more touch driving periods (e.g., T4, T6, T10, T11, T12, and T16), the touch circuit 300 may provide the touch drive signal TDS for sensing the finger touch to all or some of the touch electrodes TE among the plurality of touch electrodes TE included in the touch panel TSP.

The touch drive signal TDS may be a signal that swings between a high level and a low level. That is, the touch driving signal TDS may be a modulation signal whose voltage level is variable.

Meanwhile, among the touch driving periods (e.g., T1, T2, T3, T5, T6, T7, T9, T13, T14, and T15) for sensing the pen touch, the touch circuit 300 may supply a DC voltage having a constant voltage level to the touch panel TSP during the remaining touch driving periods (e.g., T2, T3, T5, T6, T7, T9, T13, T14, and T15) except for the touch driving period (e.g., T1) corresponding to the beacon transmission period.

Here, the DC voltage may be a low level voltage, such as the touch driving signal TDS or the beacon, may be a high level voltage, may be any voltage between the low level voltage and the high level voltage, or may be a ground voltage.

In fig. 9, touch driving performed during a touch driving period for sensing a pen touch (e.g., T1, T2, T3, T5, T6, T7, T9, T13, T14, T15) is referred to as Pen Touch Driving (PTD). The touch driving performed during the touch driving period for sensing the finger touch (e.g., T4, T6, T10, T11, T12, and T16) is referred to as Finger Touch Driving (FTD).

Fig. 10 is a diagram illustrating pen 20 according to an embodiment of the present disclosure.

Referring to fig. 10, a pen 20 according to an embodiment of the present disclosure may include: a housing 1010 configured to correspond to an outer shell; a tip 1020 configured to protrude outside the housing 1010; and a pen driving circuit 1030 configured to be disposed inside the housing 1010 to be electrically connected to the tip 1020 through one or more signal lines 1060 and to output a downstream signal through the tip 1020.

In addition, referring to fig. 10, pen 20 according to an embodiment of the present disclosure may further include: a battery 1040 configured to supply power; and various peripheral devices 1050 such as buttons, a communication module, a display, and the like.

Meanwhile, the pen driving circuit 1030 may receive an uplink signal (e.g., a beacon, a ping signal, etc.) through one or more touch electrodes TE disposed on the touch panel TSP.

The pen driver circuit 1030 may further include: a receiving unit for receiving an uplink signal through the tip 1010; a transmitting unit for transmitting a downstream signal through the tip 1010; and a controller for controlling the pen driving operation, and may further include a pressure part for measuring a pen pressure, and the like.

Meanwhile, the housing 1010 may be electrically used as a ground.

Fig. 11 is a diagram illustrating a distribution of received signal strengths of the respective touch electrodes TE with respect to a downlink signal output from the pen 20 when the pen 20 is vertically used according to an embodiment of the present disclosure. Fig. 12 is a diagram illustrating a distribution of received signal strengths of the respective touch electrodes TE with respect to a downlink signal output from the pen 20 when the pen 20 is used in an inclined manner according to an embodiment of the present disclosure.

Referring to fig. 11 and 12, the down signal output from the pen 20 may be applied only to one touch electrode TE corresponding to a point where the pen 20 is located among a plurality of touch electrodes TE included in the touch panel TSP, but generally, the touch electrode TE corresponding to the point where the pen 20 is located and two or more touch electrodes TE located in the vicinity thereof may be applied.

The signal strengths of the down signals applied to the two or more touch electrodes TE may be different from each other.

That is, the signal strength of the down signal applied to the touch electrode TE closer to the point where the pen 20 is located may be greater, and the signal strength of the down signal applied to the touch electrode TE farther from the point where the pen 20 is located may be smaller.

Accordingly, the reception signal strengths of the down signals received by the touch circuit 300 through the respective two or more touch electrodes TE may be different from each other.

Regarding the received signal strength of the downward signal that the touch circuit 300 has received through each of the two or more touch electrodes TE, for each touch electrode, a distribution DSSD _ TIP may be shown in which the received signal strength of the downward signal received through the touch electrode TE located closest to the point at which the pen 20 is located may be the highest (maximum value), while the received signal strength of the downward signal received through the touch electrode TE located farther from the point at which the pen 20 is located decreases, as shown in fig. 11.

Such a distribution DSSD _ TIP represents a received signal strength of a downward signal received for each touch electrode when the touch circuit 300 receives the downward signal output through the TIP 1020 of the pen 20 via each of the two or more touch electrodes TE. Hereinafter, the distribution DSSD _ TIP may be referred to as a TIP-related received signal strength distribution DSSD _ TIP.

The graphs of the TIP-related received signal strength distribution DSSD _ TIP in fig. 11 and 12 show the received signal strength of the downlink signal received for each position (for each touch electrode).

The touch circuit 300 may sense the pen coordinate Ps based on the received signal strength distribution DSSD _ TIP associated with the TIP.

The sensed pen coordinate Ps may correspond to a position (touch electrode) where the received signal intensity is maximum in the received signal intensity distribution DSSD _ TIP associated with the TIP.

Meanwhile, as shown in fig. 11, when the user uses the pen 20 vertically, the center axis of the pen 20 may be parallel (or the same) or substantially parallel (the same) to the normal N (vertical line) of the surface of the touch panel TSP.

In this case, the pen coordinate Ps sensed from the TIP-related received signal strength distribution DSSD _ TIP may be substantially the same as the actual position P where the pen 20 actually contacts or approaches the surface of the touch panel TSP (P ═ Ps).

However, as shown in fig. 12, when the user uses the pen 20 in an inclined manner, the center axis of the pen 20 may have a predetermined angle θ with a normal N (vertical line) of the surface of the touch panel TSP.

As the user tilts the pen 20 more heavily, the angle θ between the center axis of the pen 20 and the normal N (vertical line) of the surface of the touch panel TSP may become larger. This angle θ may be referred to as pen tilt. In some cases, pen tilt may be defined as (90 degrees- θ).

As shown in fig. 12, when the user uses the pen 20 in an inclined manner, the pen coordinate Ps sensed from the received signal intensity profile DSSD _ TIP associated with the TIP may be different from the actual position P where the pen 20 actually contacts or approaches the surface of the touch panel TSP (P ≠ Ps).

In this case, when the sensed pen coordinate Ps and the actual position P are different from each other, an error occurs in the pen touch sensing.

Accordingly, touch input processing (e.g., icon clicking (selecting) processing, handwriting processing, drawing processing, etc.) may be performed at a point different from the point P at which the user actually touches the surface of the touch panel TSP with the pen 20. In this case, the touch display device 10 may malfunction, for example, fail to perform an operation related to pen touch input or perform an unrelated operation, and may perform touch-related display at a point different from a point touched (written) by the user using the pen 20. This phenomenon may become worse depending on whether the user is right-handed or left-handed. This phenomenon is referred to as a "pen sensing error phenomenon caused by pen tilting".

Hereinafter, a touch system capable of preventing a "pen sensing error phenomenon caused by pen tilting", a touch display device 10 and a pen 20 included in the touch system, a touch driving circuit TIC, and a pen sensing method will be described.

Fig. 13 and 14 are other views showing pen 20 according to an embodiment of the present disclosure.

Referring to fig. 13 and 14, a pen 20 according to an embodiment of the present disclosure may include: a housing 1010 configured to correspond to an outer shell; a tip 1020 configured to protrude to the outside of the case 1010; and a pen driver circuit 1030 configured to be disposed within the housing 1010 and output a downstream signal through the tip 1020, and may further include a battery 1040 configured to supply power and various peripheral devices 1050, such as buttons, a communication module, a display, and the like. Meanwhile, the case 1010 may electrically serve as a ground.

Referring to fig. 13 and 14, unlike the structure of fig. 10, the pen 20 according to the embodiment of the present disclosure may further include a ring 1300 configured to be disposed inside the housing 1010 and have a shape surrounding an inner side surface of the (enclosure) housing 1010.

Since the ring 1300 does not protrude to the outside of the case 1010, the ring 1300 does not contact the touch panel TSP, but may function similarly to the tip 1020.

Since the tip 1020 serves as a medium (or a transmitting antenna) for transmitting a downlink signal, the ring 1300 may also serve as a medium (or a transmitting antenna) for transmitting a downlink signal.

Accordingly, the pen driver circuit 1030 may be disposed inside the housing 1010, may be electrically connected to one or more of the tip 1020 and the ring 1300, and may output a downstream signal through one or more of the tip 1020 and the ring 1300.

The pen driver circuit 1030 may be electrically connected to one or more of the tip 1020 and the ring 1300 via a switch SW.

The tip 1020 and the switch SW may be connected to each other through a tip wiring 1320, and the ring 1300 and the switch SW may be connected to each other through a ring wiring 1330. The pen driver circuit 1030 and the switch SW may be connected to each other through a circuit wiring 1340.

The switch SW may select one or more of the tip 1020 and the ring 1300, and may connect the selected one or more to the pen driving circuit 1030.

Meanwhile, the tip 1020 and the ring 1300 are conductors and are electrically isolated from each other. Accordingly, an insulating material 1310 made of plastic or the like exists between the tip 1020 and the ring 1300.

Meanwhile, since the tip 1020 serves as a medium (or a receiving antenna) for receiving an uplink signal, the loop 1300 may also serve as a medium (or a receiving antenna) for receiving an uplink signal.

The loop 1300 may have a coil shape as shown in fig. 14.

Meanwhile, a downstream signal having the same signal strength may be output from the tip 1020 and the ring 1300, and a downstream signal may be output from the ring 1300.

However, the downstream signal output from the tip 1020 and the downstream signal output from the ring 1300 may have different signal strengths at the location of the tip 1020.

For example, the signal strength of the downstream signal output from the loop 1300 may be attenuated by the gap L from the loop 1300 to the tip 1020 when measured at the location of the tip 1020.

Accordingly, the signal strength of the downstream signal output from the ring 1300 may be less than the signal strength of the downstream signal output from the tip 1020 when measured at the position of the tip 1020.

Meanwhile, the downstream signal output from the tip 1020 and the downstream signal output from the loop 1300 may have a phase difference.

For example, there may be a phase difference of 180 degrees between the downstream signal output from the ring 1300 and the downstream signal output from the tip 1020.

As described above, when the pen 20 includes the tip 1020 and the ring 1300 as two signal transmission media, and the down signals respectively output from the tip 1020 and the ring 1300 have a phase difference or they are received by the touch panel TSP, different received signal strengths may be exhibited, and thus the touch display device 10 may more accurately sense the pen 20.

Fig. 15 and 16 are diagrams illustrating a gap L between a tip 1020 and a ring 1300 in the pen 20 according to the embodiment of the present disclosure.

Referring to fig. 15 and 16, the ring 1300 may be positioned near or away from the end of the tip 1020.

As shown in fig. 15, when the ring 1300 is positioned near the end of the tip 1020, the gap L between the tip 1020 and the ring 1300 is shortened.

Accordingly, the downlink signal output from the loop 1300 may be applied to the touch panel TSP in a less attenuated state and may be received by the touch circuit 300.

As shown in fig. 16, the gap L between the tip 1020 and the ring 1300 becomes longer as the ring 1300 is located farther from the end of the tip 1020.

Accordingly, the down signal output from the loop 1300 may be applied to the touch panel TSP in a state of being attenuated more. Therefore, the received signal strength of the downlink signal received by the touch circuit 300 may be less than in the case of fig. 15.

Meanwhile, in the following description, in order to distinguish the downstream signal output from the tip 1020 from the downstream signal output from the ring 1300, the downstream signal output from the tip 1020 is referred to as a first downstream signal, and the downstream signal output from the ring 1300 is referred to as a second downstream signal.

Fig. 17 and 18 are diagrams illustrating a first downlink signal Rx1 and a second downlink signal Rx2 output from the tip 1020 and the ring 1300 of the pen 20 and received by the touch driving circuit TIC, respectively, according to an embodiment of the present disclosure.

The touch driving circuit TIC may receive the first downlink signal Rx1 and the second downlink signal Rx2 at the same time, or may receive them in different time zones.

Referring to fig. 17 and 18, the first and second downlink signals Rx1 and Rx2 received by the touch driving circuit TIC may be voltage level variable modulation signals.

Accordingly, the touch driving circuit TIC may accurately sense the pen coordinates and the pen tilt using the first and second downlink signals Rx1 and Rx 2.

Referring to fig. 17 and 18, the first and second downlink signals Rx1 and Rx2 received by the touch driving circuit TIC may have different amplitudes Δ V1 and Δ V2.

More specifically, the amplitude Δ V1 of the first downlink signal Rx1 received by the touch driving circuit TIC may be greater than the amplitude Δ V2 of the second downlink signal Rx2 received by the touch driving circuit TIC.

This is because the down signal output from the ring 1300 is attenuated more and received by the touch driving circuit TIC because the ring 1300 is located farther from the touch panel TSP than the tip 1020 due to the structure in which the ring 1300 is located at a position more inside the pen than the tip 1020.

The difference in amplitude Δ V1- Δ V2 between the first and second downlink signals Rx1 and Rx2 received by the touch driving circuit TIC may be proportional to the gap L between the ring 1300 and the tip 1020.

As shown in fig. 17, the first and second downlink signals Rx1 and Rx2 received by the touch driving circuit TIC may have only an amplitude difference Δ V1- Δ V2 therebetween, and may not have a phase difference therebetween.

Referring to fig. 17, the case where the first and second downlink signals Rx1 and Rx2 received by the touch driving circuit TIC have only an amplitude difference Δ V1- Δ V2 without a phase difference may correspond to the case where the tip 1020 of the pen 20 and the ring 1300 are driven in a time division manner.

As shown in fig. 18, the first and second downlink signals Rx1 and Rx2 received by the touch driving circuit TIC may have a phase difference therebetween.

For example, the first and second downlink signals Rx1 and Rx2 received by the touch driving circuit TIC may have a phase difference of 180 degrees.

As shown in fig. 18, in the case where there is a phase difference between the first and second downlink signals Rx1 and Rx2 received by the touch driving circuit TIC, the first and second downlink signals Rx1 and Rx2 can be easily distinguished from each other. Thus, this situation may correspond to a situation in which tip 1020 and ring 1300 of pen 20 are driven simultaneously.

Fig. 19 and 20 are diagrams showing a received signal intensity distribution (TIP DSSD _ TIP) of each touch electrode TE for a first downlink signal output from the TIP 1020 of the pen 20 and a received signal intensity distribution (RING DSSD _ RING) of each touch electrode TE for a second downlink signal output from the RING 1300 of the pen 20 in the case where the pen 20 according to the embodiment of the present disclosure is used vertically or in a tilted manner.

A touch system according to an embodiment of the present disclosure may include a touch display device 10 and a pen 20.

The touch display device 10 may include: a touch panel TSP configured to include a plurality of touch electrodes TE; and a touch circuit 300 configured to provide an up signal to all or some of the plurality of touch electrodes TE and receive a down signal through all or some of the touch electrodes TE.

Pen 20 may receive the up signal and may output the down signal.

The touch circuit 300 may receive the first and second down signals output from the pen 20 through all or some of the plurality of touch electrodes TE.

Here, the first downstream signal may be a downstream signal output from the tip 1020, and the second downstream signal may be a downstream signal output from the ring 1300.

The touch circuit 300 can receive the first downlink signal and the second downlink signal at different time zones or at the same time.

Meanwhile, the first and second down signals reaching the touch panel TSP may have a slight amplitude difference Δ V1- Δ V2 due to the gap L between the tip 1020 and the ring 1300.

The touch circuit 300 may sense the pen 20 based on the received signal strength of each touch electrode TE for the first downlink signal and the received signal strength of each touch electrode TE for the second downlink signal.

As shown in fig. 19, when the pen 20 is used vertically, the touch electrode TE corresponding to the maximum value of the received signal strength (maximum received signal strength) of each touch electrode TE for the first downlink signal and the touch electrode TE corresponding to the maximum value of the received signal strength (maximum received signal strength) of each touch electrode TE for the second downlink signal may be the same touch electrode TE or touch electrodes TE located very close to each other.

As shown in fig. 20, when the pen 20 is inclined at a predetermined angle or more with respect to the surface of the touch panel TSP, the touch electrode TE corresponding to the maximum value of the received signal intensity (maximum received signal intensity) of each touch electrode TE for the first downlink signal and the touch electrode TE corresponding to the maximum value of the received signal intensity (maximum received signal intensity) of each touch electrode TE for the second downlink signal may be different from each other.

Meanwhile, the touch driving circuit TIC simultaneously receives a first downlink signal from one or two or more touch electrodes TE among the plurality of touch electrodes TE included in the touch panel TSP. The touch driving circuit TIC simultaneously receives the second down signal from one or two or more touch electrodes TE among the plurality of touch electrodes TE included in the touch panel TSP. The touch driving circuit TIC simultaneously receives the first and second downlink signals from one or two or more touch electrodes TE among the plurality of touch electrodes TE included in the touch panel TSP.

The touch driving circuit TIC generates and outputs first sensing data including signal values of first downlink signals received by one or two or more touch electrodes TE. The touch controller TCR may detect a received signal strength distribution DSSD _ TIP of each touch electrode for the first downlink signal based on the first sensing data, and may calculate the TIP coordinate Pt from the detected received signal strength distribution DSSD _ TIP.

Here, the TIP coordinate Pt may correspond to a position of the touch electrode having the maximum value in the received signal intensity distribution DSSD _ TIP of each touch electrode for the first downlink signal.

The touch driving circuit TIC generates and outputs second sensing data including signal values of second down signals received by one or two or more touch electrodes TE. The touch controller TCR may detect a received signal strength distribution DSSD _ RING of each touch electrode for the second downstream signal based on the second sensing data, and may calculate the RING coordinate Pr from the detected received signal strength distribution DSSD _ RING.

Here, the RING coordinate Pr may correspond to a position of the touch electrode having the maximum value in the received signal strength distribution DSSD _ RING of each touch electrode for the second downlink signal.

As shown in fig. 19, when the user vertically uses the pen 20, the position of the maximum value in the received signal strength distribution DSSD _ TIP corresponding to each touch electrode for the first downlink signal and the position of the maximum value in the received signal strength distribution DSSD _ RING corresponding to each touch electrode for the second downlink signal may be the same or may be very close to each other. Thus, when the user uses the pen 20 vertically, the tip coordinate Pt and the ring coordinate Pr are the same or substantially the same.

As shown in fig. 20, when the user uses the pen 20 in a tilted manner, the position of the maximum value in the received signal strength distribution DSSD _ TIP corresponding to each touch electrode for the first downlink signal and the position of the maximum value in the received signal strength distribution DSSD _ RING corresponding to each touch electrode for the second downlink signal may be different from each other. Therefore, when the user uses the pen 20 in an inclined manner, the tip coordinate Pt and the ring coordinate Pr may be different from each other.

As described above, according to the received signal strength of each touch electrode TE of the first downlink signal output from the tip 1020 of the pen 20 and the received signal strength of each touch electrode TE for the second downlink signal output from the ring 1300 of the pen 20, the pen tilt condition can be accurately recognized, and the pen 20 can be more accurately sensed based on the recognized pen tilt condition.

Fig. 21 and 22 are graphs showing tip coordinates Pt and ring coordinates Pr according to a change in pen tilt θ, and an environment and a measurement result for measuring a distance D between the tip coordinates Pt and the ring coordinates Pr according to an embodiment of the present disclosure.

As shown in fig. 21, when the tip coordinate Pt and the ring coordinate P are measured and the distance D between the tip coordinate Pt and the ring coordinate Pr is measured while the pen inclination θ corresponding to the angle formed by the normal N of the touch panel TSP and the pen 20 is increased, the same result as the graph of fig. 22 may be obtained.

The graph in fig. 22 is a graph showing a change in y length (mm) according to a change in pen tilt θ. Here, when the surface of the touch panel TSP is referred to as an XY plane, the Y length is a variation amount of the Y value in the Y-axis direction and may represent variations of the tip coordinate Pt, the ring coordinate Pr, and the distance D.

Referring to fig. 22, a y-length value indicating the amount of change in the tip coordinate Pt may increase as the pen tilt θ increases. The change in the tip coordinates Pt corresponds to a sensing error of the pen coordinates.

Meanwhile, referring to fig. 22, a y-length value indicating the amount of change in the ring coordinate Pr also increases as the pen tilt θ increases. As a result, the y length value indicating the amount of change in the distance D between the ring coordinate Pr and the tip coordinate Pt can also be increased.

However, the change speed of the ring coordinate Pr is faster than the change speed of the tip coordinate Pt and the increase in the pen tilt θ.

Referring to fig. 22, when the pen 20 is further tilted toward the surface of the touch panel TSP, that is, when the pen tilt θ increases, both the tip coordinate Pt and the ring coordinate Pr may have a larger error than the actual pen position of the pen 20.

The error between the ring coordinate Pr and the actual pen position may be larger than the error between the tip coordinate Pt and the actual pen position. This may be due to the gap L between the ring 1300 and the tip 1020.

Referring to fig. 22, the touch circuit 300 measures the tip coordinates Pt and the ring coordinates Pr, and calculates a distance D between the tip coordinates Pt and the ring coordinates Pr from the measured tip coordinates Pt and ring coordinates Pr.

Considering that the error between the tip coordinate Pt and the actual pen position increases as the calculated distance D increases, the touch circuit 300 may correct the tip coordinate Pt according to the calculated distance D to finally determine the pen coordinate.

The amount of correction of the tip coordinate Pt may be proportional to the calculated distance D.

The touch circuit 300 may calculate the pen tilt θ from the measured tip coordinate Pt and the ring coordinate Pr, may determine a correction direction of the tip coordinate Pt in consideration of the calculated pen tilt θ, and may further correct the tip coordinate Pt in consideration of the determined correction.

Fig. 23 is a flowchart illustrating a pen sensing method according to an embodiment of the present disclosure, and fig. 24 is a flowchart illustrating a pen sensing operation S2330 in the pen sensing method according to an embodiment of the present disclosure.

Referring to fig. 23, a pen sensing method according to an embodiment of the present disclosure may include: operation S2310, providing, by the touch circuit 300, an up signal to all or some of the plurality of touch electrodes TE included in the touch panel TSP; operation 2320, receiving, by the touch circuit 300, the first and second downlink signals output from the pen 20 through all or some of the plurality of touch electrodes TE; and an operation S2330 of sensing pen coordinates and/or pen tilt of the pen 20 by the touch circuit 300 based on the received signal strength of each touch electrode TE for the first downlink signal and the received signal strength of each touch electrode TE for the second downlink signal.

The touch electrode TE receiving the maximum value among the received signal strengths of the respective touch electrodes TE for the first downlink signal and the touch electrode TE receiving the maximum value among the received signal strengths of the respective touch electrodes TE for the second downlink signal may be different from each other.

Using the above-described pen sensing method, the touch circuit 300 can accurately recognize the pen tilting condition according to the received signal strength of each touch electrode TE for the first downlink signal output from the tip 1020 of the pen 20 and the received signal strength of each touch electrode TE for the second downlink signal output from the ring 1300 of the pen 20, thereby more accurately sensing the pen 20.

Meanwhile, the touch circuit 300 may sense pen coordinates of the pen 20 based on the received signal strength of each touch electrode TE for the first downlink signal and the received signal strength of each touch electrode TE for the second downlink signal in operation S2330.

In addition, in operation 2330, the touch circuit 300 may sense a pen tilt θ of the pen 20 based on the received signal strength of each touch electrode TE for the first downlink signal and the received signal strength of each touch electrode TE for the second downlink signal.

The method of sensing the pen coordinates in operation S2330 described above will be described in more detail with reference to fig. 24.

Referring to fig. 24, operation S2330 may include: operation S2410 of determining, by the touch circuit 300, tip coordinates Pt of the tip 1020 included in the pen 20 according to the received signal strength of each touch electrode TE for the first downlink signal, and determining, by the touch circuit 300, ring coordinates Pr of the ring 1300 included in the pen 20 according to the received signal strength of each touch electrode TE for the second downlink signal; operation S2420 of calculating, by the touch circuit 300, a distance D between the tip coordinate Pt and the ring coordinate Pr; and operation S2430 of finally determining the pen coordinates of the pen 20 by correcting the tip coordinates Pt or the ring coordinates Pr based on the distance D between the tip coordinates Pt and the ring coordinates Pr by the touch circuit 300.

As described above, the touch circuit 300 may obtain the tip coordinates Pt and the ring coordinates Pr by receiving the first and second downlink signals output from the tip 1020 and the ring 1300 of the pen 20, and may eliminate an error component due to the pen tilt θ by using coordinate correction of the distance D between the tip coordinates Pt and the ring coordinates Pr, thereby sensing the pen coordinates more accurately.

Fig. 25 is a diagram illustrating an example of a method of calculating a pen tilt θ and pen coordinates according to a pen sensing method according to an embodiment of the present disclosure.

Referring to fig. 25, the surface of the touch panel TSP is an XY plane composed of an X axis and a Y axis, and a Z axis corresponds to a normal N of the XY plane. Assume that tip 1020 of pen 20 contacts origin (0,0,0) and pen 20 is tilted by angle θ.

Referring to fig. 25, (Ax, Ay) is the tip coordinate Pt, and (Bx, By) is the ring coordinate Pr. From the tip coordinates Pt and the ring coordinates Pr, Sx corresponding to an X-axis coordinate value difference between the tip coordinates Pt and the ring coordinates Pr and Sy corresponding to a Y-axis coordinate value difference between the tip coordinates Pt and the ring coordinates Pr are calculated. Here, Sx and Sy may be affected by the total number of touch electrodes TE arranged in a matrix form on the touch panel TSP, the size of one touch electrode TE, panel resolution, and the like.

The difference D between the tip coordinate Pt and the ring coordinate Pr can be represented by the following formula 1. In the following formula 1, Sx represents an X-axis coordinate value difference between the tip coordinate Pt and the ring coordinate Pr, and Sy represents a Y-axis coordinate value difference between the tip coordinate Pt and the ring coordinate Pr.

[ formula 1]

When the pen 20 is tilted, the pen tilt θ may be defined as an angle formed by the pen 20 and a Z-axis, which is a normal N to the surface (XY plane) of the touch panel TSP.

The pen tilt θ can be calculated from arcsin (D/L) as shown in equation 2 below. Here, D is a difference between the tip coordinate Pt and the ring coordinate Pr, and L is a gap between the tip 1020 and the ring 1300.

[ formula 2]

The X-axis component θ X and the Y-axis component θ Y of the pen tilt θ corresponding to an angle formed by the normal N of the surface (XY plane) of the touch panel TSP and the pen 20 may be calculated by the following equation 3:

[ formula 3]

H＝L×cos(θ)

In equation 3, H may correspond to a height difference between the ring 1300 and the tip 1020 when the tip 1020 is in contact with the surface (XY plane) of the touch panel TSP. L is the distance between the tip 1020 and the ring 1300.

An azimuth angle formed by an orthogonal projection of the pen 20 perpendicularly dropped to the surface (XY plane) of the touch panel TSP and the X axis

May be represented by the following formula 4. In equation 3, Sx is the X-axis coordinate value difference between the tip coordinate Pt and the ring coordinate Pr, and Sy is the Y-axis coordinate value difference between the tip coordinate Pt and the ring coordinate Pr.

[ formula 4]

For example, the pen coordinates may include: a pen inclination θ corresponding to an angle formed by a normal N of the surface (XY plane) of the touch panel TSP and the pen 20 and an azimuth angle formed by an orthogonal projection of the pen 20 perpendicularly landed on the surface (XY plane) of the touch panel TSP and the X axis

That is, the pen coordinates may be (theta,

)。

as another example, the pen coordinates may include an X-axis component θ X and a Y-axis component θ Y of the pen tilt θ corresponding to an angle formed by a normal N of the surface (XY plane) of the touch panel TSP and the pen 20. That is, the pen coordinates may be (θ x, θ y).

Considering the coordinate system of the pen 20 or the touch display device 10, two representations of pen coordinates (theta,

) And (thetax, thetay).

Operation S2330 of fig. 23 will be described using the above-described pen coordinate calculation method.

The touch circuit 300 may determine the tip coordinates Pt of the tip 1020 included in the pen 20 according to the received signal strength of each touch electrode TE for the first downlink signal, and may determine the ring coordinates Pr of the ring 1300 included in the pen 20 according to the received signal strength of each touch electrode TE for the second downlink signal.

The touch circuit 300 may calculate the distance D between the tip coordinate Pt and the ring coordinate Pr using equation 1.

Using equation 2, the touch circuit 300 may calculate the pen tilt θ based on the distance D between the tip coordinates Pt and the ring coordinates Pr, the distance L between the tip 1020 and the ring 1300, and the gap L between the tip 1020 and the ring 1300.

The touch circuit 300 may determine pen coordinates based on the pen tilt θ, the tip coordinates Pt, and the ring coordinates Pr.

For example, the pen coordinates may include a pen tilt θ corresponding to an angle formed by a normal N of the surface (XY plane) of the touch panel TSP and the pen 20, and an azimuth angle formed by an orthogonal projection of the pen 20 perpendicularly landed on the surface (XY plane) of the touch panel TSP and the X axis

That is, the pen coordinates may be (theta,

)。

As described above, the touch circuit 300 can accurately calculate the pen tilt θ, and can obtain accurate pen coordinates in which an error component due to the calculated pen tilt θ is removed.

FIG. 26 is another flow chart illustrating a pen 20 sensing method according to an embodiment of the present disclosure.

In operation 2610, the touch driving circuit TIC may generate first sensing data including a received signal strength of each touch electrode TE for a first downlink signal and second sensing data including a received signal strength of each touch electrode TE for a second downlink signal, and may transmit the generated data to the touch controller TCR.

In operation S2620, the touch controller TCR may calculate tip coordinates Pt using the first sensing data and may calculate ring coordinates Pr using the second sensing data.

In operation S2620, the touch controller TCR may determine tip coordinates Pt of the tip 1020 included in the pen 20 from the received signal strength of each touch electrode TE for the first downlink signal using the first sensing data, and may determine ring coordinates Pr of the ring 1300 included in the pen 20 from the received signal strength of each touch electrode TE for the second downlink signal using the second sensing data.

In operation S2630, the touch controller TCR may calculate a distance D between the tip coordinate Pt and the ring coordinate Pr based on the tip coordinate Pt and the ring coordinate Pr.

In operation 2640, the touch controller TCR may calculate a pen tilt θ of the pen 20 based on the distance D between the tip coordinate Pt and the ring coordinate Pr.

The touch controller TCR may correct jitter such as signal delay in operation S2650, and may finally determine the pen tilt θ in operation S2660.

In operation S2670, the touch controller TCR may calculate a constant correction value of the pen coordinate offset based on the distance D between the tip coordinate Pt and the ring coordinate Pr, and may calculate a direction correction value of the pen coordinate offset based on the pen tilt θ, thereby correcting the pen coordinate offset.

Here, the pen coordinate offset may be information that compensates for an error between the actual pen position and the sensed pen position (tip coordinate Pt). The constant correction value for the pen coordinate offset may correspond to the distance between the actual pen position and the sensed pen position (tip coordinate Pt). The direction correction value of the pen coordinate offset may correspond to a direction from the sensed pen position (tip coordinate Pt) to the actual pen position.

In operation S2680, the touch controller TCR may finally determine the pen coordinates based on the tip coordinates Pt or ring coordinates Pr, the constant correction value of the pen coordinate offset, and the direction correction value.

For example, the touch controller TCR may finally determine the pen coordinates by moving the pen coordinates by a constant correction value in a direction corresponding to the direction correction value in the tip coordinates Pt.

Using the above pen sensing method, more accurate pen coordinates can be obtained through coordinate correction according to the inclination of the pen 20.

Fig. 27 is a diagram illustrating driving timings of touch driving operations between the touch display device 10 and the pen 20 according to the embodiment of the present disclosure when the tip 1020 and the ring 1300 of the pen 20 are driven in a time-division manner, and fig. 28 is a diagram illustrating a switching structure example of each of the tip 1020 and the ring 1300 of the pen 20 according to the embodiment of the present disclosure when the tip 1020 and the ring 1300 are driven in a time-division manner.

The pen driving circuit 1030 may drive the tip 1020 and the ring 1300 in a time-division manner.

The pen driving circuit 1030 may output a down signal through the tip 1020 during the tip driving period and then may output a down signal through the ring 1300 during the ring driving period.

According to the example of fig. 27, the tip driving period may be a touch driving period T2, T9, or T13 for sensing pen coordinates, and the tip coordinates Pt may be calculated at this time. The ring driving period may be a touch driving period T5 for sensing the pen tilt, and the ring coordinate Pr may be calculated at this time.

The touch circuit 300 may obtain the tip coordinates Pt based on the first down signal output from the tip 1020 during the tip driving periods T2, T9, and T13.

The touch circuit 300 may obtain the ring coordinates Pr based on the second downlink signal output from the ring 1300 during the ring driving period T5.

The touch circuit 300 may calculate a difference D between the tip coordinates Pt and the ring coordinates Pr using the tip coordinates Pt and the ring coordinates Pr during the ring driving period T5, and may calculate the pen tilt.

In addition, the touch circuit 300 may perform pen coordinate correction using the difference D between the tip coordinates Pt and the ring coordinates Pr in the pen coordinate sensing periods T9 and T13.

As described above, when the tip 1020 and the ring 1300 in the pen 20 are driven in a time division manner, the first and second downlink signals may be output from the pen 20 at different periods. That is, the first down signal may be output from the tip 1020 during the touch driving periods T2, T9, and T13 corresponding to the tip driving period, and the second down signal may be output from the ring 1300 during the touch driving period T5 corresponding to the ring driving period.

When the pen 20 drives the tip 1020 and the ring 1300 in a time division manner, since the touch circuit 300 receives the first and second downlink signals at different time zones, the first and second downlink signals do not have to be distinguished from each other. Thus, pen driver circuit 1030 of pen 20 can provide the same downstream signal to tip 1020 and ring 1300 in different time zones. That is, the pen driving circuit 1030 does not need to separately generate the first downstream signal to be output through the tip 1020 and the second downstream signal to be output through the loop 1300.

In this manner, pen 20 may include a first switching circuit 2800 to control the timing of the driving of tip 1020 and ring 1300 and to control the transmission of downstream signals to tip 1020 and ring 1300.

Referring to fig. 28, the first switch circuit 2800 may electrically connect the tip 1020 to the pen driving circuit 1030 at first timings T2, T9, and T13 corresponding to the tip driving period, and may electrically connect the ring 1300 to the pen driving circuit 1030 at second timings T5 different from the first timings T2, T9, and T13 and corresponding to the ring driving period.

Using the first switch circuit 2800 described above, the tip 1020 of the pen 20 and the ring 1300 can be driven efficiently in a time-division manner.

Fig. 29 is a diagram illustrating driving timings of touch driving operations between the touch display device 10 and the pen 20 according to the embodiment of the present disclosure when the tip 1020 and the ring 1300 of the pen 20 are simultaneously driven, and fig. 30 is a diagram illustrating an example of a switching structure of each of the tip 1020 and the ring 1030 of the pen 20 according to the embodiment of the present disclosure when the tip 1020 and the ring 1030 of the pen 20 are simultaneously driven.

Pen driver circuit 1030 can drive tip 1020 and ring 1300 simultaneously.

The pen driving circuit 1030 may output the first and second down signals through the tip 1020 and the ring 1300 during touch driving periods T2, T5, T9, and T13 corresponding to the tip and signal driving periods.

Since the first and second downstream signals are simultaneously output through the tip 1020 and the ring 1300, respectively, the first downstream signal output from the tip 1020 and the second downstream signal output from the ring 1300 should be distinguishable from each other.

Accordingly, the first downstream signal output from the tip 1020 and the second downstream signal output from the loop 1300 may have different phases. That is, the first downstream signal output from the tip 1020 and the second downstream signal output from the loop 1300 may have a phase difference (e.g., a phase difference of 180 degrees).

The touch driving periods T2, T5, T9, and T13 corresponding to the tip and ring driving periods are periods for sensing the pen coordinates and the pen tilt together.

Therefore, the tip coordinates Pt and the ring coordinates Pr may be calculated together during the touch driving periods T2, T5, T9, and T13 corresponding to the tip and ring driving periods.

The touch circuit 300 may calculate a difference D between the tip coordinates Pt and the ring coordinates Pr by using the tip coordinates Pt and the ring coordinates Pr calculated together during the touch driving periods T2, T5, T9, and T13 corresponding to the tip and ring driving periods, and may calculate the pen tilt.

The touch circuit 300 may perform pen coordinate correction in the pen coordinate sensing periods T9 and T13 using the difference D between the tip coordinate Pt and the ring coordinate Pr.

As described above, when the tip 1020 and the ring 1300 are simultaneously driven in the pen 20, the first and second downlink signals may be output from the pen 20 during the same time periods T2, T5, T9, and T13. That is, during the touch driving periods T2, T5, T9, and T13 corresponding to the tip and ring driving periods, the first and second down signals may be simultaneously output from the tip 1020 and the ring 1300.

In this manner, when the pen 20 drives the tip 1020 and the ring 1300 at the same time, the touch circuit 300 may receive the first and second downlink signals at the same time zone to sense the pen coordinates and the pen tilt together, thereby enabling faster pen sensing.

In this manner, in order to control the driving timing of the tip 1020 and the ring 1300 and control the transmission of the down signal to the tip 1020 and the ring 1300, the pen 20 may include the second switching circuit 3000.

Referring to fig. 30, the second switch circuit 3000 may simultaneously electrically connect the tip 1020 and the ring 1300 to the pen driving circuit 1030 during touch driving periods T2, T5, T9, and T13 corresponding to the tip and ring driving periods.

Using the second switch circuit 3000 described above, the tip 1020 of the pen 20 and the ring 1300 can be effectively driven simultaneously.

According to the example of fig. 27, during 16 touch driving periods T1 to T16 corresponding to one touch frame period, the pen coordinates may be sensed three times during three touch driving periods T2, T9, and T13, and the pen tilt may be sensed once during one touch driving period T5.

Therefore, assuming that 16 touch driving periods T1 to T16 correspond to one display frame period and the display driving frequency is 60Hz, the driving frequency for sensing the pen coordinates is 180Hz (═ 3 × 60Hz), and the driving frequency for detecting the pen tilt is 60 Hz.

According to the example of fig. 29, during 16 touch driving periods T1 to T16 corresponding to one touch frame period, pen coordinates may be sensed four times during four touch driving periods T2, T5, T9, and T13, and pen tilting may be sensed four times.

Accordingly, assuming that 16 touch driving periods T1 through T16 correspond to one display frame period and the display driving frequency is 60Hz, the driving frequency for sensing the pen coordinates is 240Hz (═ 4 × 60Hz), and the driving frequency for sensing the pen tilt is also 240Hz (═ 4 × 60 Hz).

As shown in fig. 29, when the first and second downlink signals are simultaneously output from the pen 20 (i.e., when the pen coordinate and the pen tilt are simultaneously sensed or when the tip 1020 and the ring 1300 are simultaneously driven), the driving frequency for sensing the pen coordinate is the same as the driving frequency for sensing the pen tilt θ.

As shown in fig. 27, when the first and second downlink signals are output at different periods in the pen 20 (i.e., when the pen coordinates and the pen tilt are sensed in a time-division manner or when the tip 1020 and the ring 1300 are driven in a time-division manner), the driving frequency for sensing the pen coordinates and the driving frequency for sensing the pen tilt may be the same as or different from each other according to the number of tip driving periods and ring driving periods.

Meanwhile, referring to fig. 27 and 29 and fig. 9, during a first period (T2, T5, T9, T13; T3, T6, T7, T14, T15) in which the first and second down signals are output from the pen 20, a DC voltage may be applied to one or more of the plurality of touch electrodes TE.

Here, the first period may include touch driving periods T2, T5, T9, and T13 for sensing pen coordinates and/or pen tilting, and touch driving periods T3, T6, T7, T14, and T15 for sensing data including pen additional information.

As described above, during the first period T2, T5, T9, T13, T3, T6, T7, T14, and T15 in which the down signal output from the pen 20 is applied to the touch panel TSP, a DC voltage may be applied to the touch panel TSP, so that the touch circuit 300 may more accurately recognize the down signal output to the pen 20.

Referring to fig. 27 and 29 and fig. 9, a modulation signal may be applied to one or more of the plurality of touch electrodes TE during a second period (T4, T8, T10, T11, T12, T16) different from a first period (T2, T5, T9, T13; T3, T6, T7, T14, T15) in which the first and second down signals are output from the pen 20.

Here, the voltage level variable modulation signal may be a touch driving signal TDS for sensing a finger touch, as shown in fig. 9.

During the second period T4, T8, T10, T11, T12, and T16, the touch circuit 300 may sense a touch of a finger based on a signal received through one or more touch electrodes TE in response to the voltage level variable modulation signal TDS.

As described above, the modulation signal of which the voltage level is variable may be applied to the touch panel TSP during the second period (T4, T8, T10, T11, T12, T16) different from the first period (T2, T5, T9, T13; T3, T6, T7, T14, T15) in which the down signal is output from the pen 20, so that the touch circuit 300 may sense the touch of the finger.

Fig. 31 is a diagram illustrating an example of a touch driving circuit TIC according to an embodiment of the present disclosure.

Referring to fig. 31, the touch driving circuit TIC according to the embodiment of the present disclosure may include a first multiplexer circuit MUX1, a sensing cell block SUB including a plurality of sensing units SU, a second multiplexer circuit MUX2, an analog-to-digital converter (ADC), and the like.

The first multiplexer circuit MUX1 may include one or two or more multiplexers. The second multiplexer circuit MUX2 may include one or two or more multiplexers.

Each sensing unit SU may comprise a preamplifier pre-AMP, an integrator INTG and a sample-and-hold circuit SHA.

The pre-AMP may be electrically connected to one or two or more touch electrodes TE through a first multiplexer circuit MUX 1.

The pre-AMP may provide touch driving signals to one or two or more touch electrodes TE connected through the first multiplexer circuit MUX 1.

The pre-AMP may receive a sensing signal from one touch electrode TE to be sensed among one or two or more touch electrodes TE connectable through the first multiplexer circuit MUX 1. Here, the sensing signal may be a sensing signal for sensing a touch of a finger or a down signal output from the pen 20.

The integrator INTG integrates the signal output from the preamplifier pre-AMP. The integrator INTG may be integrated into the preamplifier pre-AMP and implemented.

The analog-to-digital converter ADC may output sensing data obtained by converting the integrated value output to the integrator INTG into a digital value to the touch controller TCR.

Here, the sensing data may be sensing data for sensing a touch of a finger, or sensing data for sensing a touch of the pen 20 or pen-attached information.

Fig. 32 is a block diagram illustrating a touch driving circuit TIC according to an embodiment of the present disclosure.

Referring to fig. 32, the touch driver circuit TIC according to an embodiment of the present disclosure may include: a driving unit 3210 configured to provide an up signal to all or some of the plurality of touch electrodes TE included in the touch panel TSP; a sensing unit 3220 configured to generate and output sensing data when the first and second downlink signals output from the pen 20 are received through all or some of the plurality of touch electrodes TE.

The driving unit 3210 may include a pre-amplifier pre-AMP of fig. 31.

The sensing unit 3220 may include the integrator INTG, the sample-and-hold circuit SHA, and the analog-to-digital converter ADC of fig. 31.

When the pen 20 is used vertically, the touch electrode TE receiving the maximum value among the received signal strengths of the respective touch electrodes TE for the first downlink signal and the touch electrode TE receiving the maximum value among the received signal strengths of the respective touch electrodes TE for the second downlink signal may be the same or may be adjacent touch electrodes.

When the pen 20 is inclined at a predetermined angle or more with respect to the surface of the touch panel TSP, the touch electrode TE receiving the maximum value among the received signal strengths of the respective touch electrodes TE for the first downlink signal and the touch electrode TE receiving the maximum value among the received signal strengths of the respective touch electrodes TE for the second downlink signal may be different from each other.

The amplitudes of the first and second downlink signals at the respective output points of the tip 1020 and the ring 1300 of the pen 20 may be the same.

However, at a point where the touch driving circuit TIC receives the first and second downlink signals, the first and second downlink signals may have different amplitudes. This is because the distance between the ring 1300 and the touch panel TSO is longer than the distance between the tip 1020 and the touch panel TSP.

Meanwhile, the first and second downstream signals output from the tip 1020 and the ring 1300 of the pen 20 may have no phase difference.

The first and second downlink signals output from the tip 1020 and the ring 1300 of the pen 20 and received by the touch driving circuit TIC may have a phase difference.

When the tip 1020 and the ring 1300 in the pen 20 are driven in a time division manner, the first and second down signals may be output from the pen 20 in different periods (touch driving periods).

Unlike this, when the tip 1020 and the ring 1300 are simultaneously driven in the pen 20, the first and second down signals may be output from the pen 20 in the same period (touch driving period).

According to the embodiments of the present disclosure described above, even if the user uses the pen 20 in a tilted manner, the pen 20 can be accurately sensed.

In addition, according to the embodiment of the present disclosure, the pen 20 having two signal transmission media (the tip 1020 and the ring 1300) is provided, and the pen tilt can be more accurately sensed by the pen 20.

In addition, according to the embodiment of the present disclosure, the pen 20 can be effectively sensed by driving the two signal transmission media (the tip 1020 and the ring 1300) of the pen 20 in a time division manner.

In addition, according to an embodiment of the present disclosure, by simultaneously driving two signal transmission media (tip 1020 and ring 1300) of pen 20, pen 20 can be sensed quickly.

The above description and drawings are provided only as examples of the technical concept of the present disclosure, and it will be understood by those skilled in the art to which the present disclosure pertains that various forms of modifications and changes, such as combinations, separations, substitutions, and changes in configurations, may be made to the embodiments described herein without departing from the essential characteristics of the present disclosure. Accordingly, the embodiments disclosed in the present disclosure are not intended to limit but describe the technical concept of the present disclosure, and do not limit the scope of the technical concept of the present disclosure. The scope of the present disclosure should be construed based on the appended claims, and all technical concepts included within the equivalent scope of the claims should be construed as being included in the scope of the present disclosure.

Cross Reference to Related Applications

This application claims priority from korean patent application No.10-2017-0184149, filed on 29.12.2017, the entire contents of which are incorporated herein by reference as if fully set forth herein.

Claims

1. A touch driver circuit, the touch driver circuit comprising:

a driving unit configured to provide an up signal to all or some of a plurality of touch electrodes included in a touch panel; and

a sensing unit configured to generate and output sensing data when a first down signal output from a tip of a pen and a second down signal output from a ring of the pen are received through all or some of the plurality of touch electrodes,

wherein, when the pen is inclined by a predetermined angle or more with respect to the surface of the touch panel, a touch electrode receiving a maximum value of the received signal strength of each touch electrode for the first downlink signal and a touch electrode receiving a maximum value of the received signal strength of each touch electrode for the second downlink signal are different from each other, and

wherein pen coordinates and pen tilt are sensed based on the received signal strength of each touch electrode for the first downlink signal and the received signal strength of each touch electrode for the second downlink signal.

2. The touch drive circuit of claim 1, wherein each of the first and second downlink signals is a voltage level variable modulated signal.

3. The touch drive circuit of claim 1, wherein the first and second downlink signals have different amplitudes.

4. The touch drive circuit of claim 1, wherein the first and second downlink signals have a phase difference therebetween.

5. The touch driving circuit according to claim 1, wherein the first and second down signals are output from the pen during different periods.

6. The touch driving circuit according to claim 1, wherein the first and second down signals are output from the pen during a same period.

7. A touch display device, the touch display device comprising:

a touch panel configured to include a plurality of touch electrodes; and

touch circuitry comprising one or more touch drive circuits according to any of claims 1-6 for providing touch drive signals to the touch panel and receiving touch sense signals from the touch panel.

8. The touch display device of claim 7, wherein the touch circuitry:

sensing pen coordinates based on the received signal strength of each touch electrode for the first downlink signal and the received signal strength of each touch electrode for the second downlink signal, and

pen tilt is sensed based on the received signal strength of each touch electrode for the first downlink signal and the received signal strength of each touch electrode for the second downlink signal.

9. The touch display device of claim 8, wherein a drive frequency for sensing the pen coordinates is different from a drive frequency for sensing the pen tilt.

10. The touch display device of claim 8, wherein a drive frequency for sensing the pen coordinates is the same as a drive frequency for sensing the pen tilt.

11. The touch display device according to claim 8, wherein when the surface of the touch panel is a plane composed of an X axis and a Y axis, the pen coordinates include an X axis component and a Y axis component of an angle formed by a normal line of the surface and the pen.

12. The touch display device of claim 8, wherein when the surface of the touch panel is a plane consisting of an X-axis and a Y-axis, the pen coordinates comprise an angle formed by a normal to the surface and the pen, and an azimuth angle formed by an orthogonal projection of the pen landing perpendicularly to the surface and the X-axis.

13. The touch display device of claim 7, wherein a DC voltage is applied to one or more of the plurality of touch electrodes during a first period in which the first and second downlink signals are output from the pen.

14. The touch display device of claim 13, wherein a modulation signal is applied to one or more of the plurality of touch electrodes during a second period of time different from the first period of time during which the first and second downlink signals are output from the pen.

15. The touch display device of claim 14, wherein during the second time period, the touch circuitry senses a touch of a finger based on signals received through one or more touch electrodes in response to the modulated signal.

16. A pen, the pen comprising:

a housing;

a tip configured to protrude to an outside of the housing;

a ring configured to be disposed inside the housing and having a shape to surround an inner side surface of the housing; and

a pen drive circuit configured to be disposed inside the housing, electrically connected to one or more of the tip and the ring, and output a downstream signal through one or more of the tip and the ring,

Wherein the pen driving circuit drives the tip and the ring in a time-division manner or simultaneously,

wherein the pen is sensed based on a received signal strength of each touch electrode for a first downlink signal and a received signal strength of each touch electrode for a second downlink signal, and

wherein, when the pen is inclined by a predetermined angle or more with respect to a surface of the touch panel, the touch electrode receiving the maximum value of the received signal strength of each touch electrode for the first downlink signal and the touch electrode receiving the maximum value of the received signal strength of each touch electrode for the second downlink signal are different from each other.

17. The pen of claim 16, further comprising:

a first switch circuit configured to electrically connect the tip to the pen driving circuit at a first timing when the tip and the ring are driven in a time-division manner, and to electrically connect the ring to the pen driving circuit at a second timing different from the first timing.

18. The pen of claim 16, further comprising:

a second switching circuit configured to simultaneously electrically connect the tip and the ring to the pen driving circuit when the tip and the ring are simultaneously driven.

19. A pen sensing method, comprising the steps of:

providing an up signal to all or some of a plurality of touch electrodes included in a touch panel;

receiving a first downlink signal and a second downlink signal output from a pen through all or some of the plurality of touch electrodes; and

sensing pen coordinates and/or pen tilt of the pen based on the received signal strength of each touch electrode for the first downlink signal and the received signal strength of each touch electrode for the second downlink signal,

wherein the first downlink signal and the second downlink signal are received during different periods or during the same period, and

wherein, when the pen is inclined by a predetermined angle or more with respect to the surface of the touch panel, the touch electrode receiving the maximum value of the received signal strength of each touch electrode for the first downlink signal and the touch electrode receiving the maximum value of the received signal strength of each touch electrode for the second downlink signal are different from each other.

20. The pen sensing method according to claim 19, wherein said step of sensing pen coordinates and/or pen tilt of said pen comprises the steps of:

Determining tip coordinates of a tip included in the pen according to a received signal strength of each touch electrode for the first downlink signal, and determining ring coordinates of a ring included in the pen according to a received signal strength of each touch electrode for the second downlink signal,

calculating a distance between the tip coordinates and the ring coordinates; and

the pen coordinates are finally determined by correcting the tip coordinates or the ring coordinates based on the distance between the tip coordinates and the ring coordinates.

21. The pen sensing method according to claim 19, wherein said step of sensing pen coordinates and/or pen tilt of said pen comprises the steps of:

calculating a distance between the tip coordinate and the ring coordinate based on the tip coordinate and the ring coordinate,

calculating a pen tilt of the pen based on the distance,

calculating a constant correction value of the pen coordinate offset based on the distance, and calculating a direction correction value of the pen coordinate offset based on the pen tilt; and

Determining the pen coordinate based on the tip coordinate or the ring coordinate, the constant correction value of the pen coordinate offset, and the direction correction value.

22. A touch system, the touch system comprising:

a touch display device configured to include a touch panel including a plurality of touch electrodes and a touch circuit for providing an up signal to all or some of the plurality of touch electrodes and receiving a down signal through all or some of the plurality of touch electrodes; and

a stylus configured to receive the upstream signal and output the downstream signal,

wherein the touch circuit performs the following operations:

receiving a first and a second downlink signal output from the pen through all or some of the plurality of touch electrodes, an

Sensing the pen based on a received signal strength of each touch electrode for the first downlink signal and a received signal strength of each touch electrode for the second downlink signal, wherein

When the pen is inclined with respect to the surface of the touch panel by more than or equal to a predetermined angle, the touch electrode receiving the maximum value of the received signal strength of each touch electrode for the first downlink signal and the touch electrode receiving the maximum value of the received signal strength of each touch electrode for the second downlink signal are different from each other.